.center {
    /*background-color: #728e1b;*/
    /*border-style: dotted dashed solid dotted;*/
    border: 1px solid red;
    /*text-align: center;*/
    width: 1000px;
}

body {
    display: flex;
    justify-content: center;

    margin: 0;

}

/*--------------------------------------------top----------------------------*/
.top {
    /*background-color: #728e1b;*/
    background-image: url("../img/banner_qtah.jpg");
    /*    如果只是设置了背景图片，那么当前div的高度和div里面的内容一致*/
    /*    怎么将背景图片完整显示呢？定义div高度*/
    /*    height: 808px;*/
    /*    width: 1920px;*/
    width: 1000px;
    /*高度应该和宽度按比例缩放*/
    height: calc(1000 * 808px / 1920);
    /*    如果我们图片的像素太大，或者太小，那么我们就需要将图片和div的大小保持一致*/
    background-size: 100% 100%;
    color: white;
}

/*----------------------*/
.top > div:nth-child(1) {
    display: flex;
    justify-content: center;
}

.top > div:nth-child(1) > div {
    width: 900px;
    /*边框大小  边框样式 边框颜色*/
    /*border: 1px solid red;*/
    display: flex;
    justify-content: space-between;
}
.top > div:nth-child(1) > div >div:nth-child(2){
    display: flex;
    align-items: center;
}
.top > div:nth-child(1) > div >div:nth-child(1){
    height: 141px;
}